CVE-2018-20969

HIGH

GNU Patch < 2.7.6 - OS Command Injection

Title source: rule

Description

do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-13638, but the ! syntax is specific to ed, and is unrelated to a shell metacharacter.

References (9)

[Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/154124/GNU-patch-Command-Injection-Directory-Traversal.html

[Patch, Vendor Advisory] https://git.savannah.gnu.org/cgit/patch.git/commit/?id=3fcd042d26d70856e826a42b5f93dc4854d80bf0

[Various Sources] https://github.com/irsl/gnu-patch-vulnerabilities

View Writeup ZIP pw:eip

[Exploit, Mailing List, Patch, Third Party Advisory] https://seclists.org/bugtraq/2019/Aug/29

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2019:2798

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2019:2964

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2019:3757

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2019:3758

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2019:4061

Scores

CVSS v3 7.8

EPSS 0.0035

EPSS Percentile 57.3%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Classification

CWE

CWE-78

Status published

Affected Products (1)

gnu/patch < 2.7.6

Timeline

Published Aug 16, 2019

Tracked Since Feb 18, 2026